Mcgill



(No Model.)

C. W. MOGILL.

INSULATED ELECTRIC CONDUCTOR.

Patented Cot. 3C, 1883.

www MW v f7@ C l Ml R 0 T N E V N Tl UNITED STATES PATENT OFFICE.

GEORGE NV. MOGILL, OF NEI/V YORK, N. Y.

INSULATED ELECTRIC CONDUCTOR.

lSPECIFICATION forming part 0f Letters Patent No. 287,766, dated. October 30, 1883,

Application filed September '1, 1853.

To all whom it may concern:

Beit known that I, GEORGE W. MCGILL, of the city and county of New York, in the State of New York, have made a newand useful Improvement in Insulated Electric Conductors, of which the following is a specifica tion.

The object of my invention is the better in* sulating of electric conductors from the influence of moisture and heat, and the manner in which I effect this object is as follows:

I take a suitable electric conductor-such as a wire of copper or other suitable metaland give the naked Wire a continuous coating of fire-proof material-such as asbestus or other paint. Upon this coating I placea continuous covering of cotton or other suitable fibrous material, either by winding or braiding it thereon in the usual manner in which Wire is covered, and preferably While the fireproof covering on the naked wire is in such moist condition as to cause it to saturate the fibrous covering. I now treat this fibrous covcring with a coating of Water-proof material, consisting of a mixture composed of one part of glycerine with three parts of glue. This composition has properties similar to those of india-rubber, and is impervious to water and moisture, and is elastic and tough. Over this water-proof coating I put another covering of fibrous material, which is in turn treated with a coatingoftheiire-proofmaterialfirstdescribed,

A and after this outer coating of fire-proof material is dry the article is passed through a compressing-machine and calendered.

In the accompanying drawings, making part of this specification, Figure l is a longitudinal view of the insulated conductor, showing the manner in which the insulating material is applied to the electric conductor; and Fig. 2 is a cross-section of the same.

A represents the metal wire or electric con ductor.

I) represents the first coating of fire-proof material.

c represents the first covering of brous material, and d represents the coating of waterproof material consisting of glue and glycer ine.

(No model.)

c represents a second fibrous covering, and f the outside coating of fire-proof material.

In carrying out my invention the order in which the fire-prooi` material and the waterprooil material are applied-to the metal conductor may be varied and repeated without avoiding my invcntion-that is to say, my Waterproof material may be applied direct to the naked wire and a jacketing ot' fibrous material put over the same, and the fibrous j acket in turn treated with the fire-proof material; or the iibrous jacketing may be put upon the Anaked wire, the water-proof material on top of the fibrous jacketing, a second covering of fibrous material over the Waterproof material, and an outer coating of reproof material over the second fibrous covering; and the relative positions of the waterproof material, the fibrous covering, and the tire-proof material to the wire and to themselves may be still further changed and duplicated without inaterially changing the efficiency of the insulation or affecting the scope of my invention.

W'hat I claim herein, and desire to secure by Letters Patent, is-

l. An electric conductor provided with an insulating-covering consisting of a composition of glue and glycerine, substantially as andfor the purposes described.

2. An electric conductor provided with an insulating-covering consisting of one or more jackets of iibrous material treated with a coniposition of glycerine and glue, substantially as and for the purposes described.

3. An electric conductor provided with an insulating-covering consisting of one or more fibrous jackets treated with a water-proof material composed of glycerine and glue, in combination with one or more brous jackets treated with fireproof paint, substantially as and for the purposes described.

GEORGE NV. MCGILL.

\Vitn sses:

A. H. BRADLEY, W. H. GREENLAND. 

